Variable compression ratio piston

Details Variable compression ratio piston Variable compression ratio piston

F - Mech Eng,Light,Heat,Weapons

02

F

121/90

F02F 3/28 (2006.01) F02B 75/04 (2006.01)

Patent

CA 1062565

VARIABLE COMPRESSION RATIO PISTON Abstract of the Disclosure A two part variable compression ratio (VCR) piston assembly having an outer member movable relative to an inner member to vary the compression ratio of an internal combustion engine and a hydraulic system utilizing oil from the lubrica- tion system of the engine for automatically controlling the relative movement of the members to maintain a predetermined maximum combustion chamber pressure. A hydraulic circuit includes an upper and a lower chamber which expands and contracts conversely upon relative movement of the piston members, and a system for supplying oil to the upper chamber and to the lower chamber via the upper chamber, for discharging the oil from the upper chamber in a manner which gradually changes the compression ratio of the cylinder until a pre- determined maximum combustion chamber pressure has been achieved, and which tends to maintain the maximum combustion chamber pressure after it has been achieved. The lower chamber is disposed adjacent the piston ring area and a sealing ring is utilized as a valve for regulating oil flow from the upper chamber to the lower chamber.

275981

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